The objective bounds improve slowly!

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3 comments

  • Ting Liang

    Hi, Nazanin,

    excuse me.

    I have encountered the same problem, did you find the reasons and solutions now?

    thanks.

     

    best regards

    Ting, Liang

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  • Nazanin Madani

    Hello Ting,

    I realized that my SOC constraint causes this issue, and makes the problem hard to solve. Besides, I wanted to solve a big problem. When I chose smaller ones, it solves but still takes time. Just make sure to play around with MIPFocus and NodeMethod parameters if you are solving a MIP.

    Cheers

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  • Ting Liang

    Dear Nazanin Madani,

    Thanks for your reply.

    Can I further ask how you deal with your problems, to improve the constraints or improve setting parameters or both?

    By the way, can you expand a bit about the constraints problem, like 'big-M constraints' or too loose constraints or...? 

    As I am now stuck here for several days, having tried checking the model carefully(variables & constraints&objectives) and tuning some parameters, including the ones you mentioned.

    thanks a lot, and looking forward to your reply.

     

    best regards

    Ting, Liang

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